Radio apparatus



C. R. GARRETT RADIO APPARATUS Jul 15, 1930 Filed May 19, 1928 t, v e l n o ma t Q6 ,t v A M -8 w H 1; .C

Patented July 15, 1930 UNITED STATES PATENT. OFFICE CHARLES R. GARRETT, OF SCOTIA, NEW YORK, ASSIGNOR TO GENERAL EIlECTRIC COMPANY, A CORPORATION OF NEW YORK RADIO APPARATUS Application filed May 19,

My invention relates to radio apparatus including a loud speaker and receiving set which are enclosed in the, same cabinet, and has for its principal objects the provision of an improved arrangement of parts whereby the transmission of sound vibrations from the speaker to the receiving set is avoided.

It is sometimes desirable to include in a common cabinet a radio receiving set and m loud speaker or the like. In the operation of such combinations difliculties are encountered because of sound vibrations transmitted, both by air and along the loud speaker bafile-board, to the walls of the cabinet and thence to the receiving set. Such vibrations are converted by the receiving set into electrical vibrations which in turn are transmitted to the loud speaker and are reconverted into a continuous howl having a pitch or frequency approximately equal to the resonance frequency of the loud speaker compartment. I

In accordance with my invention this difliculty is overcome by mounting a bafile board of the loud speaker in such manner that compartment resonance is reduced or eliminated and the direct transmission of vibrations from the bafile-board to the walls of the compartment is greatly reduced. In the illustrated embodiment of my invention, these results are accomplished by provision of a long, narrow bafile-board which'is mounted at an obli ue angle with the walls or certain of the wal sof the cabinet. Under these conditions, the vibrations due to the mechanical connections between the cabinet walls and the bathe-board are greatly reduced and the tendency of the walls of the cabinet to vibrate in synchronism with the baflie-board is avoided. By a long, narrow bailie-board, is meant one having a length suflicient to reach diagonally substantially across the interior of the cabinet or of the compartment and having a width less than that of the interior of the cabinet or of the compartment.

The novel features which, I believe, to be characteristic of m invention are pointed out in the appende claims. The invention itself, however, will best be understood by reference to the drawing which illustrates a 1928. Serial No. 279,158.

radio apparatus wherein my invention has been embodied.

This apparatus includes a cabinet 1 divided into two compartments by a partition 2. The upper compartment contains the receiving set and is closed at the front by a control panel 3 of the set. The lower compartment is closed at the front by a screen 4 which is partially broken away in the drawing to show the interior of the compartment. Within the lower compartment is mounted a loud speaker 5 which is attached. to a battleboard 6, this bafile-board being shown as attached along one of its edges to the floor of the cabinet as far to the front as screen 4 will permit and along another of its edges to the back wall of the cabinet as high up as the partition 2 will permit.

The mounting of the loud-speaker or sound producer 5 on the narrow baffle-board 6, placed along a diagonal of the lower compartment, at an angle with one of the walls such as the rear wall, substantially as shown in the present example wherein the bafiieboard is inclined backwardly from front to rear, largely eliminates the effect of compartment resonance and the increased bafile length made possible by this construction has the effect of materially reducing the intensity of the vibrations transmitted from the loud speaker 5 to the walls of the cabinet.

What I claim as new and desire to secure by Letters Patent of the United States is:

1. In a radio apparatus including a cabinet, along narrow baflle-board mounted within said cabinet at an oblique angle to the walls thereof to eliminate the efiet of compartment resonance, and a sound producer mounted on said baffle-board.

2. In a radio apparatus including a cabinet, a baflle-board mounted in said cabinet at an oblique angle with the walls thereof, and a sound producer mounted on said bafileboard.

3. In a radio apparatus including a cabinet, a baflle-board mounted in said cabinet at an oblique angle with certain of the wallsv thereof and mechanically connected to said walls along only; two of its edges, and a sound producer mounted on said baflle-board.

4. In combination, a sound producer, a cabinet adapted to provide a common housing for a radio receiving apparatus and said sound producer, a baflie board for and associated with the sound producer, said bafile board being mounted in the cabinet and secured along two of its edges to the walls thereof at an oblique angle to said walls whereby compartment resonance and the transmission of sound vibrations to such receiving apparatus are prevented.

5. In combination, a sound producer, a cabinet adapted to provide a common housing for a radio receiving apparatus and said sound producer, a long narrow baflle board for said sound producer, said bafile board being mounted within and extending diagonally across the interior of the cabinet between two of the walls thereof.

6. In combination, a sound producer, a. cabinet adapted to provide a common housing for a radio receiving apparatus and said sound producer, means providing a compartment in said cabinet for said sound producer, and a bafile board for the sound producer extending at an oblique angle with respect to certain of the walls of said compartment said baflle board being of a width less than that of said compartment.

In witness whereof, I have hereunto set my hand this 18th day of May, 1928.

CHARLES R. GARRETT. 

